I need help making a summer playlist! please read?

I want fun, light-hearted music like "Somethin' Special" by Colbie Caillat, "Hot Air Balloon" and "Strawberry Avalanche" by Owl City, "Trouble" by NeverShoutNever!, and "Happy" by Natasha Bedingfield. Can you please help me out by putting together a 10-20 song playlist of music similar to these kinds of songs? Thanks =]